Shuffle in ID3 mode does not actually shuffle :P (FW 2.59)

[musicyay]

I'm using this setup:

Boundary: All
Shuffle: On

but when browsing in ID3 mode (either albums or artists) the shuffle function won't work (it plays only tracks from the same album/artist and does not "shuffle" into other albums)

It works just fine if I browse by folders, though

Any ideas why?